package com.heima.app.gateway.filter;

import com.heima.app.gateway.utils.AppJwtUtil;
import io.jsonwebtoken.Claims;
import org.springframework.cloud.gateway.filter.GatewayFilterChain;
import org.springframework.cloud.gateway.filter.GlobalFilter;
import org.springframework.core.Ordered;
import org.springframework.http.HttpStatus;
import org.springframework.http.server.reactive.ServerHttpRequest;
import org.springframework.http.server.reactive.ServerHttpResponse;
import org.springframework.stereotype.Component;
import org.springframework.util.StringUtils;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Mono;

@Component
public class AuthorizeFilter implements Ordered, GlobalFilter {
    @Override
    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
        //获取请求和响应
        ServerHttpRequest request = exchange.getRequest();
        ServerHttpResponse response = exchange.getResponse();
        //判断是否是登录请求,是放心
        if (request.getURI().getPath().contains("/login")){
            return chain.filter(exchange);
        }
        //获取token
        String token = request.getHeaders().getFirst("token");
        //不是判断token是否为空
        if (StringUtils.isEmpty(token)){
            response.setStatusCode(HttpStatus.UNAUTHORIZED);
            return response.setComplete();
        }
        Claims claimsBody = AppJwtUtil.getClaimsBody(token);
        //获得token解析后的用户信息
        Object userId = claimsBody.get("id");
        //在header中添加新消息
        ServerHttpRequest serverHttpRequest = request.mutate().headers(httpHeaders -> {
            httpHeaders.add("userId", userId + "");
        }).build();
        //重置header
        exchange.mutate().request(serverHttpRequest).build();


        //是否过期
        int i = AppJwtUtil.verifyToken(claimsBody);
        //有问题返回401
        if (i==1||i==2){
            response.setStatusCode(HttpStatus.UNAUTHORIZED);
            return response.setComplete();
        }
        //没问题放行
       return chain.filter(exchange);


    }

    @Override
    public int getOrder() {
        return 0;
    }
}
